Electro-motor-driven vertical centrifugal machine



A Feb. l, 1944. J. w. LUBBERHUIZEN 2,340,542

ELECTRO-MOTOR DRIVEN VERTICAL CENTRIFUGAL MACHINE- Original Filed Nov.21, 1938 Patented Feb. i, 1944 UNITEDb sTATEs PATENT oFFicEELECTRO-DIOTOR-DRIVEN VERTICAL CENTRIFIUGAL MACHINE Jan WillemLubberhnizen, Lobositz, Germany vested in the Alien Property CustodianOriginal application November Z1, 1938, Serial No.`

Divided and this application December 23, 1939, Serial No. 310,722. Inthe Netherlands November 23, 1937 2 Claims. V(Cl. 248-26) The inventionrelates to an electro-motor driven vertical centrifugal machinev inparticular a spinning pot for artificial silk, provided with elasticsupporting means, such as rubber shock absorbers, connected to thecasing of the machine.

This way of resiliently supporting the motor is generally known. Inknown constructions, however, the particular requirementsv to befulfilled by these supporting elements were not sufllciently taken intoaccount. The invention is based upon the consideration that the motor,upon being started and as long as the number of revolutions has not yetreached the first critical number,

' should be able to follow the oscillating movepot the axis of gravityremains in position and the motor should then be' able to perform asmall precession motion at the bottom. Based on this insight theinvention consists in this that the shock absorbers each have a portionthat is freely slidable over centering pins or in centering holes of thefoundation or stationary motor support whereas between the upper side ofsaid pins or holes and the lower side of the motor casing there is alaterally non-clamped or free shockabsorber-length.

The shock absorbers are thus vertically compressible while at the sametime the amount of play between the shock absorber portion surroundingthe centering pin or inserted intov the centering hole of the stationarysupport enables the motor to be tilted and to fall back in a limiteddegree. The motor once having reached its normal number of revolutions,the laterally free shock-absorber-length referred to above may beslightly distorted by the shearing'stresses produced; in the case oi? alaterally clamped in shock absorber this would be impossible and also inthe case of a shock absorber rigidly attached to the motor by means of abolt or pin passing therethrough. Thus, according to the invention, afree shock absorber length affording the shock absorbing effect iscombined with a shock absorber length for the centering of the motor.

Further features of the invention will be described herelnafter withreference to the accompanying drawing, in which Figs. 1, 2 and 3 arevertical sections of three embodiments of shock absorbers for anelectromotor-driven vertical centrifugal machine according to theinvention.

Fig. 4 is a vertical section of an electrical driving deviceincorporating the present invention as illustrated in Fig. 3.

In Fig. 4 a vertical spindle I, upon the upper end of which a spinningpot may be mounted, has been inserted into the hollow shaft 2 of a rotor3 which together with a stator 4 constitutes the electromotor drivingthe spindle. rIhe spindle is ofthe type disclosed e. g. in the U. S.patent specification No. 2,089,933,` but it may of course be of othertype. The spindle is axially slidable but non-rotatable with respect tothe hollow rotor shaftl by reason of the fact that the lower end of thespindle is provided with a slot 5 which in the --position shown in Fig.4 receives a transverse pin 6 secured in the lower end of the hollowrotor shaft. The spindle may be removed from the hollow rotor shaft bytaking it out axially and upwards.

It is also possible to couple the lower spindle end to the hollow rotorshaft in another way than shown in Fig. 4. The spindle atits lower endmight have laterally projecting ribs received in corresponding verticallongitudinal grooves in the lower wall portion of the hollow rotor shaftso that the'spindle may be inserted from above with said ribs into thegrooves of said wall portion which to this end will have to be thicker vthan the wall portion located thereabove.

The lcap at its lower edge is provided with an annular bead I-I adaptedto receive under tension an annular spring I9 for securing the cap to alower casing I5'. The spring is of the type shown in dotted lines and isconstituted by a resilient wire in the form of a split ring havingoutwardly projecting ends 20, 20 adapted to be moved towards yoneanother so as to reduce the diameter of the spring and thereby unlockthe cap I4.

Insertion and removal of the spindle as well as of the motor andbearings is thus very simple. Screw connections need not be establishedor unscrewed. l

'I'he hollow rotor shaft 2 is supported exclusively underneath thestator 4 in two superposed and spaced bearings I2 and I3. They may bothbe combined axial-and-radial-thrust-bearings, or

one of them may be a bearing of this type and the other one a tubularbearing. the essential point being that they enable the rotor shaft androtor to be inserted and removed in axial direction. The stator casingII is supported upon elastic, rubber shock-absorbers 22. shownseparately in Fig. 3.

In Fig. 1 in the lower side of the stator-casing I6, in a recess definedby a depending collar 2|,

the upper end of a rubber shock absorber 22 is clamped. This shockabsorber is in its bottom provided with a recess 23 into which projectswith some circumferential play a-centeiing pin 24 upon the upper surfaceof which the rubber shock absorber is supportedawith the bottom of itsrecess. The lower end surface 26 of the shock absorber is located atsome 'distance above the foundation or stationary support 26 into whichthe centering pin 24 is secured. It follows that there is a laterallynon-clamped or free shock absorber length a between the lower side ofthe casing i4 and the upper side of the pin 24 and that further therubber shock absorber will be compressed between said surfaces. Therubber is thus conned between said surfaces and is not subjected totensile stress.

In Fig. 2 the rubber shock absorber 22 is clamped in the' stator casingI6 by means of a relatively thin portion 21 having at its upper end acollar or thickened head 28. For the rest this embodiment is equivalentto that according to Fig. 1.

In Fig. 3 the rubber shock absorber 22 is provided at its upper end witha collarless relatively thin portion 21 clamped in the casing i6. At itslower end the shock absorber 22 is provided with a relatively thinportion 29 which is inserted with circumferential play into a hole 30 ofthe stationary support 26. The shock absorber 22 is entirely solid.

In Figs. 1 and 2 the hollow or tubular .lower end of the shock absorber22 and the centering pin '24 have essentially the same centeringfunction as the thin portion 29 of the shock absorber and l the hole inthe stationary support in Fig. 3. Also in the latter embodiment therubber of the shock absorber is confined between the stationary support26 and the lower side of the stator-casing I8 and again there is alaterally non-clamped or free shock-absorber-length, denoted by b,between the casing and the stationary support. The lower end of theshock absorber at 3| is entirely free.

I claim:

1. In a vertical electric motor driven centrifugal machine, a casing, amotor in said casing, a. support for said motor and casing, verticallyextending rubber shock absorber elements, each element comprising anupper portion encompassed by the casing and having a height relativelysmall in regard to the total height of the element, an intermediatelaterally unconilned portion resiliently movable laterally and `havingpart of its cross sectional area resting on the support, and a lowersupport engaging portion extending downwardly of the portion resting onsaid support and having an amount of radial play between itself and thesupport so as to insure a limited resilient lateral movability of saidlower portion.

2. In a vertical electric motor driven centrifugal machine, a casing, amotor in said casing, a

support for said motor and casing, vertically extending rubber shockabsorber elements, each element comprising an upper portion encompassedby the casing and having a height relatively l small in regard to thetotal height of the element,

an intermediate laterally unconned portion resiliently movable laterallyand having part of its Across sectional area resting on the support, anda lower support engaging portion extending downwardly of the portionresting on said support and around a portion of said support and havingan amount of radial play between itself and the support so as to insurea limited resilient lateral movability of said lower. portion.

JAN WILLEM LUBBERHUIZEN,

